"Wind-borne pollution from China and neighboring countries is spreading to California and other parts of the nation and Canada as a result of surging economic activity and destructive farming practices half a world away, according to new scientific studies."

Some interesting paragraphs from the LA Times article

"Mixed with all the dust is another menace: Toxic and industrial pollutants from farms, factories and power plants. China's coal-burning power plants and factories emit roughly 40 million tons per year of sulfur oxides, the most in the world and double the U.S. emissions of that pollutant."

"Also, pesticides that have been banned in the United States are part of the fallout from dust blowing off farmland in China, said Dan Jaffe, atmospheric chemist at the University of Washington. Among the pesticides detected are DDT, toxaphene and dieldrin, he said."

I doubt China cares what the americans breathe and will do nothing to help diminish the problem.

SteveS